在Docker中使用Spring保存文件后“const_get'：未初始化的常量（NameError）'
我在Spring和Guard中使用Docker中的rails。 请参阅Guardfile：
guard 'rspec', cmd: "#{env_vars} spring rspec -color -f doc", :all_on_start => false, :all_after_pass => false do watch(%r{^spec/.+_spec\.rb$}) 奇怪的问题：当上面的命令中有spring标签时，我在运行规范时遇到了一个错误，但只是在以某种方式保存了容器中的一个文件之后。 这是错误的：
/usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/inflector/methods.rb:268:in `const_get': uninitialized constant User (NameError) from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/inflector/methods.rb:268:in `block in constantize' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/inflector/methods.rb:266:in `each' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/inflector/methods.rb:266:in `inject' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/inflector/methods.rb:266:in `constantize' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:583:in `get' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:614:in `constantize' from /usr/local/bundle/gems/devise-4.2.0/lib/devise.rb:301:in `get' from /usr/local/bundle/gems/devise-4.2.0/lib/devise/mapping.rb:81:in `to' from /usr/local/bundle/gems/devise-4.2.0/lib/devise/mapping.rb:76:in `modules' from /usr/local/bundle/gems/devise-4.2.0/lib/devise/mapping.rb:93:in `routes' from /usr/local/bundle/gems/devise-4.2.0/lib/devise/mapping.rb:160:in `default_used_route' from /usr/local/bundle/gems/devise-4.2.0/lib/devise/mapping.rb:70:in `initialize' from /usr/local/bundle/gems/devise-4.2.0/lib/devise.rb:331:in `new' from /usr/local/bundle/gems/devise-4.2.0/lib/devise.rb:331:in `add_mapping' from /usr/local/bundle/gems/devise-4.2.0/lib/devise/rails/routes.rb:241:in `block in devise_for' from /usr/local/bundle/gems/devise-4.2.0/lib/devise/rails/routes.rb:240:in `each' from /usr/local/bundle/gems/devise-4.2.0/lib/devise/rails/routes.rb:240:in `devise_for' from /usr/src/app/config/routes.rb:34:in `block in <top (required)>' from /usr/local/bundle/gems/actionpack-5.0.1/lib/action_dispatch/routing/route_set.rb:389:in `instance_exec' from /usr/local/bundle/gems/actionpack-5.0.1/lib/action_dispatch/routing/route_set.rb:389:in `eval_block' from /usr/local/bundle/gems/actionpack-5.0.1/lib/action_dispatch/routing/route_set.rb:371:in `draw' from /usr/src/app/config/routes.rb:1:in `<top (required)>' from /usr/local/bundle/gems/railties-5.0.1/lib/rails/application/routes_reloader.rb:40:in `load' from /usr/local/bundle/gems/railties-5.0.1/lib/rails/application/routes_reloader.rb:40:in `block in load_paths' from /usr/local/bundle/gems/railties-5.0.1/lib/rails/application/routes_reloader.rb:40:in `each' from /usr/local/bundle/gems/railties-5.0.1/lib/rails/application/routes_reloader.rb:40:in `load_paths' from /usr/local/bundle/gems/railties-5.0.1/lib/rails/application/routes_reloader.rb:16:in `reload!' from /usr/local/bundle/gems/railties-5.0.1/lib/rails/application/routes_reloader.rb:26:in `block in updater' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/file_update_checker.rb:77:in `call' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/file_update_checker.rb:77:in `execute' from /usr/local/bundle/gems/railties-5.0.1/lib/rails/application/routes_reloader.rb:7:in `execute' from /usr/local/bundle/gems/railties-5.0.1/lib/rails/application/finisher.rb:132:in `block (2 levels) in <module:Finisher>' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:396:in `instance_exec' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:396:in `block in make_lambda' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:169:in `call' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:169:in `block (2 levels) in halting' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:547:in `call' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:547:in `block (2 levels) in default_terminator' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:546:in `catch' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:546:in `block in default_terminator' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:170:in `call' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:170:in `block in halting' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:454:in `call' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:454:in `block in call' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:454:in `each' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:454:in `call' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:101:in `__run_callbacks__' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:750:in `_run_run_callbacks' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/callbacks.rb:90:in `run_callbacks' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/execution_wrapper.rb:108:in `run!' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/reloader.rb:113:in `run!' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/reloader.rb:48:in `block (2 levels) in reload!' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/reloader.rb:46:in `tap' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/reloader.rb:46:in `block in reload!' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/execution_wrapper.rb:85:in `wrap' from /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/reloader.rb:45:in `reload!' from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application.rb:154:in `serve' from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application.rb:131:in `block in run' from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application.rb:125:in `loop' from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application.rb:125:in `run' from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application/boot.rb:19:in `<top (required)>' from /usr/local/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /usr/local/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in `require' from -e:1:in `<main>' 19:33:45 - ERROR - Failed: "BYEBUG=true spring rspec -color -f doc -r /usr/local/bundle/gems/guard-rspec-4.7.3/lib/guard/rspec_formatter.rb -f Guard::RSpecFormatter --failure-exit-code 2 spec/controllers/api/buyside/ideas_controller_spec.rb" (exit code: 1)
如果我在一个新的容器中运行规格，这个错误不会发生，直到我保存在COPY d代码中的文件。 保存任何文件后，当我尝试运行规格时出现错误。
如果我运行没有spring标签的guard命令，我也不会得到这个错误，但是当然我不再有弹簧预加载的好处，所以specs超慢。
任何想法发生了什么？ 最近升级到Rails之前没有这个问题5.很高兴发布其他相关信息。
提前致谢。
这个问题在这里讨论： rails / spring＃519
正如那个问题所暗示的，解决方法是禁用急切的加载。
在config/environments/test.rb你改变了;
config.eager_load = true
至
config.eager_load = false